Denon DRA-800H Service Manual page 79

3-2. Error Code H1-02 failure detection procedure
Checking device. (HDMI SW)
Checking the reset waveform. (HDMI SW)
Check item(3-2.1.). Checking the reset waveform :
Check the waveform.
When the power is turned on, is the TP"787_RST" waveform cor-
rect (as shown in the figure)?
787_RST
IC701
YES
Check item(3-2.2.). Checking the HDMI SW :
Remove the [R7147/R7149].
Is the waveform of "I2C" the correct waveform?
YES
HDMI SW [IC701] is faulty.
Replace with a new device.
Recheck from check item (3.1.).
If it does not work, replace the PCB.
Examples of confirmation waveform
Voltage scale：1.0V/div
Time scale：20ms/div
NO
Check the reset circuit between
CPU [IC751] and HDMI SW [IC701].
If there is no problem, the HDMI
SW [IC701] is faulty.
Replace with a new device.
NO
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